The Yeti Coolers Rambler 30oz Slider fits also a 20oz Tumbler. The Yeti Rambler Series' sturdy construction and insulating excellence have always made them great travel companions, but the lids have always left users wanting a bit more. Yeti Coolers seeks to solve that issue with new splash-resistant Tumbler Slider Lids which turn Yeti's drinkware into true road warriors. Just push the slider forward to keep your cups contents contained, then slide it back when youre ready for a drink. This closeable lid is shatterproof, dishwasher safe, and BPA-free. Perfect as a replacement lid or just a spill-resistant lid alternative.